class Vertex {
	private:
		int id;
	public:
		
	Vertex(int id) {
		this -> id = id;
	}
	
	~Vertex() {
	}
	
	// return all incoming edges map
	void getIncoming() {
	
	}
	// return all outgoing edges map
	void getOutgoing() {
	
	}
	
};
